Traditional hair removal technology such us IPL and E-light are with multi-pulse mode which focus energy on first pulse, it is pain and very easy to burn skin, besides, they are usually with no more than 1HZ frequency. while they have some advantages of selectiveness. The following SHR machine is with single pulse mode can emit energy averagely, it gradually heats the dermis with OPT square-wave pulse, and passed over the tissue multiple times using low energy but a high rate of repetition (up to 10HZ), which can penetrate directly into hair follicle. It speed up the treatment, save time, reduce pain and and more effective. While people can still feel pain after treating for a while. based on SHR technology, it has a perfect cooling system which ensures the great refrigerating capacity of handle, and makes the contact area between crystal and skin still -10°C~ 0°Ceven after a long working time.